import random
import time
import uuid


# 生成0-2的数
def num():
    a = random.randint(0,2)
    return a
def num0():
    a = random.randint(1,3)
    return a
def uuid_random():
    return str(uuid.uuid4())

##等待时间N秒
def sleep(sleep_time=5):
    print("Start : %s" % time.ctime())
    time.sleep(sleep_time)
    print("End : %s" % time.ctime())